The number of floors in Tibia is limited. You can see this by browsing the map on the game.
There are many places that reach the highest possible floor. One example: Before entering the falcon bastion you'll access its tower at Edron, there you'll walk up to the 7th floor. The carpet at Kazoordon is another place that reaches the 7th floor. There is a tower at Carlin castle that also reach this floor.
To know all places that reach the 7th floor you can browse the mapper